Hand clamp



Oct. 16, 1923. 1,470,106

W.Y A. DAY

HAND CLAMP Filed Feb. 8, 1923 William 19.170,3l INVENTOR.

BY 116mb, y

A TTORNEY Patented @et 16, 1923.

l tiene faire srTESvPetET WWE W'ILLIAIVI A. DAY, OF BELLINGHM,XVASHINGTON, ASSIGNORHOF ONE-HALF TO HARRY V. SALTZGABER, 4OFBELLINGHAM, VASHINGTONJ `Application led February 8, 1923. Serial No.617,667.

To (/ZZ 'whom `it may concer/n: y Be it known that l,.WrLLiAivr A. DAY,a

` citizen of the United States, and al resident of Bellingham, in thecounty, of Whatcom and State of lVashington, have invented a new anduseful Hand Clamp, of whichthe following is a specification. i y

My invention relates to improvementsin hand clamps, and one of,theobjects of,my

improvements is to provide a hand clamp in which the press rod isxnotturned by the operation of setting the clamp, another object of myimprovement is to provide a handy clamp having;` a beveledftooth rackindepend ent of the setting screw. and a further object` of myimprovement is to provide a `hand clamp having a finely threaded settingscrew.

I attain these objects with. the mechanism illustrated in` theaccompanying` sheet of drawings, which yforma part ofthis specification.and in which Figure 1 is a side eleration` of myhandnclamp and Fig'. 2is a pla-n view of the upper jaw of the clamp in section on the line 2-2Similar characters refer to similar parts throughout, and certain partsare broken away in order to show other parts hidden thereby.

More particularly: A Ui-form `clamp 3 has lower jaw 4 and upper jaw 5.Pawl hous-` ingr 6 is fastened to the lower side of the upper arm of theclamp and in it pawl 7 can reciprocate. Pawl pin a7 is fixed in saidpawl and protrudes downward through a slot iu said housing within reachof a lingerof the operator. A spring 8 reacts between the closed end ofhousing 6 and the inner end of pawl 7 and tends to protract said pawl.Jaw 5 has a hole therethrough the projected center line of which wouldpass through the center of jaw 4. .ln this hole is mounted rack rod 9having toothed rack 10 on the side next the clamp frame. The upper sidesof rack teeth 10 are preferably normal to the longitudinal axis of rod9. Rack 10 is adapted for engagement by pawl 7 the upper surface of thebit of which is beveled4 to lit with the lower side of teeth 10 and thelower side of said bit engages with and bears on the upper side of teeth10. Thus downward pressure on rack rod 9 forces pawl 7 to retractagainst spring 8 and permit 'teeth 10 to pass downward, but it willengage with said teeth to prevent upward movement of said rack rodtillpawl 7 is withdrawn by pressure on finger pin a?. Teeth 10 donot extend`to the upper end of rod 9 and said upper end is `cylindrical andprovid-.eo witlf-.j

aI fine screwfthread 11. `The lower end ot a longnut 12` is threaded toengage with threaded body ll and haswings al? onits upper end. -Rack rod`9 is .hollow from end` l' to endand in it is mounted press rod 13 forreoiprocation. is a circular, crowned head 14. and on its lower end isscrewed foot discnl. A helical springlG is mountedpn .rod lbeneath its itween jaw 4 and foot disc 15. Then iawy 4 is held aga-inst the lowerside of thework while pressure downward on wings w12 forces foot disc 15to bear on the upper surface of the work. When the clamp is thus inplace on the work a few turns ofwings L12 will press foot 15 firmlyyagainst the work and tightly clamp the same with screw pressure fromline screw threads 11. In applyingr this screw pressure foot disc 15 isnot revolved `on the work because its friction therewith exceeds thefriction between press-rod head 14 and plusr 17. and. the surfaces ofthese two members move easily on each other To release the clamp` a fewbackward turns of wings (L12 relieves the pressure on the pawl 7 and itis withdrawn from engagement with teeth 10 and press rod 13 and raclurod 9 are simultaneously drawn away from the. workby hand pressureheneath wings a, when the work can be re- `with the quick action of therack and pawl @n the upperend of rod 13l without introducing the looseconstruction of the well-known metal carpenters hand clamp.

Having thus disclosed my invention, what I claim as new and desire tosecure by Letters Patent is,-

l. In a hand clamp in combination, a clamp body having' a lower jawadapted to bear on the lower side of the work and an uppe-r jaw having ahole therethrough the axis of which intersects said lower jaw adapted tomount a rack rod for reciprocation, a hollow rack rod mounted ttorreciprocation in said jaw hole having a toothed rack and a threadedupper body, a pawl mounted on said clamp body adapted toen- ,qage withsaid rack whereby said rack rod is retained from reciprocating in saidjaw hole, a press rod ymounted for reciprocation in said rack rodprot-rudinfr from both ends of said rack rod and havingr a head on itsupperv end, a helical spring 'mounted'on said press rod between itsliea'dand the upper end of said. rack rod whereby said press rod iscaused to bearon a wingy nut` wing nut engaged on the said Athreadedbody ot said rack rod adapted to bear on said press rod head wherebywhen said wing nut is screwed on said rack rod said press rod is forcedtoward said lower against the pressure of' said sprin'. c

2. In 'a hand clamp in combination, a

clamp body having a lower jaw adapted to bear on the lower Side of thework, and an upper jaw having a hole therethrough in line with saidlower jaw, a hollow rack rod mounted for reciprocation in said jaw holethe teeth of said rack, a spring` in said pawl housing reacting betweensaid housing and the outer end of said pawl whereby said pawl is forcedto engage with said teeth, a press rod mounted for reciprocation in saidrack rod with its ends' protruding therebeyond having a toot disc on itslower yend and a head on its upper end, ay helical spring mounted onsaid press rod adapted to react between the head thereof and the upperend of said rack rod, a wing nut screwed on the upper end of said rackrod, and a screw plug in the upper end `of said wing nut adapted to bear.onsaid press-rod head whereby said rack` rod can be forced downwardagainst the holding: power of said pawl to cause said foot disc to bearontli'e upper side ot the work and said press rod can be forced furtherdownward to cause said foot dise to vbear harder on said work byscrewing said wing nut down on said rack rod.

WLLIAM A. DAY.

